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AUSCERT External Security Bulletin Redistribution
ESB-2021.0631
cURL vulnerability CVE-2020-8284
19 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8284
Reference: ESB-2020.4506
ESB-2020.4364
ESB-2020.4343
Original Bulletin:
https://support.f5.com/csp/article/K63525058
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K63525058: cURL vulnerability CVE-2020-8284
Original Publication Date: 19 Feb, 2021
Security Advisory Description
A malicious server can use the FTP PASV response to trick curl 7.73.0 and
earlier into connecting back to a given IP address and port, and this way
potentially make curl extract information about services that are otherwise
private and not disclosed, for example doing port scanning and service banner
extractions. (CVE-2020-8284)
Impact
If curl is used from the F5 product and it connects to a malicious FTP server,
an attacker can manipulate curl to access restricted information.
For products with ** in the various columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Support has no additional information about this issue.
Security Advisory Status
F5 Product Development has assigned ID 978441 (BIG-IP) and CPF-25231 (Traffix)
to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
+------------------+------+----------+----------+----------+------+-----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|known to |introduced|Severity |score^|component |
| | |be |in | |1 |or feature |
| | |vulnerable| | | | |
+------------------+------+----------+----------+----------+------+-----------+
| |16.x |16.0.0 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | |curl/ |
|BIG-IP (LTM, AAM, +------+----------+----------+ | |libcurl |
|Advanced WAF, AFM,|14.x |14.1.0 - |None | | |(Command |
|Analytics, APM, | |14.1.3 | | | |Line |
|ASM, DDHD, DNS, +------+----------+----------+Low |3.1 |Interface, |
|FPS, GTM, Link |13.x |None |Not | | |EAV |
|Controller, PEM, | | |applicable| | |Monitors, |
|SSLO) +------+----------+----------+ | |iRules) |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+-----------+
| |7.x |None |Not | | | |
|BIG-IQ Centralized| | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+-----------+
|F5OS |1.x |** |** |** |** |** |
+------------------+------+----------+----------+----------+------+-----------+
|Traffix SDC |5.x |5.1.0 |None |Low |3.1 |curl/ |
| | | | | | |libcurl |
+------------------+------+----------+----------+----------+------+-----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
**Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated and
will update this article with the most current information as soon as it has
been confirmed. F5 Support has no additional information on this issue.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
o Restrict the Management Interface access to only trusted users. For more
information regarding the BIG-IP system, refer to the following article:
K13092: Overview of securing access to the BIG-IP system.
o Connect to only trusted FTP servers.
o Use the following curl command line option:
--ftp-skip-pasv-ip
This option causes curl to ignore the IP address that the server suggests
for the data connection. Instead, curl uses the same IP address it is using
for the control connection.
For example:
curl --ftp-skip-pasv-ip -k -u user ftp://10.1.1.100/get_file -o /shared/tmp
/get_file
Note: This could cause problems in the uncommon instance where the server
needs the client to connect back to an IP address other than the control
connection IP address.
o If feasible, use the --ftp-skip-pasv-ip mitigation with the EAV monitors or
iRules that use curl to access the FTP servers, or just remove the EAV
monitors or iRules.
Supplemental Information
o K41942608: Overview of security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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